Read the fineprint. No commercial blog allowed. So later on when you are really making money, if they think that's enough, your account will be deleted.

If you are making money some other way other then blogging on the site then be careful. If it's a blogger account somebody got his blog deleted too.

Sorry, no explanation given

It seems that Google doesn't like it if you are making "too much" money from Adsense.

As long as you are under the radar, then it's ok.

New applications are also hard to be approved.